Add .isNotEmpty term entry for Dart Map

content/dart/concepts/map/terms/is-not-empty/is-not-empty.md

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+---
+Title: '.isNotEmpty'
+Description: 'Returns true if a Map contains one or more key-value pairs.'
+Subjects:
+  - 'Computer Science'
+  - 'Code Foundations'
+Tags:
+  - 'Dart'
+  - 'Map'
+  - 'Properties'
+CatalogContent:
+  - 'learn-dart'
+  - 'paths/computer-science'
+---
+
+In Dart, the **`.isNotEmpty`** property is used to check whether a `Map` contains at least one key-value pair. It returns `true` if the map has one or more entries, and `false` if the map is empty.
+
+This property is commonly used in conditional checks to ensure a map has data before accessing or processing its contents.
+
+## Syntax
+
+```pseudo
+map.isNotEmpty
+```
+
+**Parameters:**
+
+This property does not take any parameters.
+
+**Return value:**
+
+Returns a boolean value:
+
+- `true`: The map contains one or more key-value pairs.
+- `false`: The map contains no key-value pairs.
+
+## Example: Checking for Entries Before Iterating Over a Map
+
+This example demonstrates how `.isNotEmpty` can be used to iterate over a map only when it contains data. It also shows how the property behaves when applied to an empty map:
+
+```dart
+void main() {
+  Map<String, String> countryCodes = {
+    'US': 'United States',
+    'IN': 'India',
+  };
+
+  if (countryCodes.isNotEmpty) {
+    countryCodes.forEach((code, country) {
+      print('$code -> $country');
+    });
+  } else {
+    print('The map is empty.');
+  }
+
+  Map<String, int> emptyMap = {};
+
+  print(emptyMap.isNotEmpty); // false
+}
+```
+
+The output of this code is:
+
+```shell
+US -> United States
+IN -> India
+false
+```